| scale_color_map | R Documentation | 
Create a custom number of colors to use for graphing or mapping based on preset color palettes.
scale_color_map(palette, num, na.value = "grey90", rev = FALSE)
| palette | color palette name | 
| num | number of colors to create | 
| na.value | a color value for NA, defaults to light gray | 
| rev | condition to reverse the order of the colors | 
a ggplot color palette
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